People engaged in Fishery Farming know that fish farming requires water first, and the best aquaculture method is to achieve circular aquaculture. The circular aquaculture mode can reduce the dependence of the aquaculture process on the surrounding water environment, reduce the sewage discharge in the aquaculture process, improve the survival rate, reduce the aquaculture risk, improve the output and quality, and realize green aquaculture. It is of great significance to the healthy and sustainable development of aquaculture, Its market prospect is very broad.

The traditional fishery water treatment technology level is low and the equipment is simple. Most of them only stay in the stage of simple sedimentation filtration air flotation disinfection. Without efficient biochemical treatment measures, it is impossible to realize circulating water aquaculture. Moreover, there is a lack of detoxification treatment measures for small molecule toxic compounds such as pesticides and herbicides in aquaculture raw water, which is an important factor limiting the sustainable development of aquaculture in China.

The traditional culture methods of bass in China are: 1. Offshore cage culture; 2. Single culture in freshwater ponds; 3. Single culture in brackish freshwater ponds. These farming methods have also exposed many disadvantages, such as: limited site selection, large investment, high risk, low output and difficult to improve farming technology.

The closed circulating water high-density aquaculture of perch is very particular. According to the characteristics of the fish such as strong disease resistance and fast growth, with the help of the advantages of the canvas pond fish culture system, the special feed configuration, the use of microbial agents and other technical means, as well as the intervention of advanced culture technology concepts and management technologies, the closed zero discharge and pollution-free culture process is implemented, and finally stable and efficient output is achieved.

What preparations should be made before releasing the bass fry? First of all, we must set up and plan the circulating aquaculture system in the canvas pool; Secondly, it is necessary to correctly select perch fry, which are more than 3cm long, neat in size, clear in back color and strong in activity, and choose sunny weather; In addition, it is necessary to choose a good weather to put bass fry.

The daily management in the process of bass breeding is also very important, such as the control of feeding technology, water quality control in the breeding canvas pool, daily inspection and measurement, sewage treatment, etc. In addition, we want to talk about the disease prevention and control in the process of bass breeding separately. The disease control of perch culture mainly adopts the principle of "prevention first, prevention combined, prevention more important than cure". There are three basic aspects we must do:

(1) Parasitic diseases are generally taken orally in combination with Chinese herbal medicine bath, such as rotifer diseases, which are taken orally with Compound Kushen powder and mixed materials;

(2) For bacterial venereal diseases, Chinese herbal medicines are generally taken orally in combination with body surface disinfection. For example, for bacterial enteritis, 5% Sanhuang powder is generally used for one week, and 10% PVP-I is externally used for disinfection, so that the effective I concentration reaches 0.3-0.5ppm;

(3) For fungal infection, body surface disinfection and oral administration are generally used. For example, 10% acetylsalicylic acid and 5% electrolytic multi-dimensional mixture are generally used for internal administration of water mildew.

Water environment pollution is the most serious challenge facing China's aquaculture industry at present. The deterioration of water quality increases the cost of aquaculture, reduces the success rate, increases the risk and decreases the benefit. Environmental hormones enter the fishery waters through sewage, waste dumping, leakage, runoff and other ways, which have a significant impact on the fishery ecological environment and aquatic product quality, and their potential threat is becoming increasingly serious.

Set up and plan the perch culture system, recommend the water circulation culture system in the canvas pool, and make use of the pond symbiosis and mutual benefit and complementarity principles according to the principle of microbial decomposition to jointly promote the material and energy circulation in the culture water environment, give full play to the role of the microbiota, reduce aquaculture emissions, make full use of water resources, reduce diseases, reduce aquaculture costs, and promote the healthy culture of perch.

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